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Subject[PATCH 17/58] [GFS2] Given device ID rather than s_id in "id" sysfs file
From: Bob Peterson <>

This patch changes the /sys/fs/gfs2/<s_id>/id file to give the device
id "major:minor" rather than the s_id. That enables gfs2_tool to
match devices properly (by id, not name) when locating the tuning files.

Signed-off-by: Bob Peterson <>
Signed-off-by: Steven Whitehouse <>

diff --git a/fs/gfs2/sys.c b/fs/gfs2/sys.c
index 1359198..65dd065 100644
--- a/fs/gfs2/sys.c
+++ b/fs/gfs2/sys.c
@@ -32,7 +32,8 @@ spinlock_t gfs2_sys_margs_lock;

static ssize_t id_show(struct gfs2_sbd *sdp, char *buf)
- return snprintf(buf, PAGE_SIZE, "%s\n", sdp->sd_vfs->s_id);
+ return snprintf(buf, PAGE_SIZE, "%u:%u\n",
+ MAJOR(sdp->sd_vfs->s_dev), MINOR(sdp->sd_vfs->s_dev));

static ssize_t fsname_show(struct gfs2_sbd *sdp, char *buf)

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